Every other nozzle size on this site can be discussed as a trade between detail and speed. At a full millimetre that framing breaks down, because the nozzle is no longer what limits the printer. The hotend is, comprehensively, and no choice you make in the slicer changes that.
What a full millimetre asks for
| Figure | Value |
|---|---|
| Diameter | 1.0 mm |
| Practical maximum layer height | 0.75 mm |
| Typical extrusion width | 1.15 mm |
| Realistic volumetric flow | 25–70 mm³/s |
That upper figure requires a hotend built specifically for volume. A mainstream melt zone will not approach it.
What "the hotend is the limit" looks like in practice
A 150 mm-tall part with a 22,500 mm² footprint, 0.7 mm layers, 10% infill, head speed set to 120 mm/s:
- Requested flow: 96.6 mm³/s
- Delivered flow: 47.5 mm³/s
- Effective head speed: 59 mm/s, less than half what was asked for
- Estimated time: 4 hours 27 minutes, over 215 layers, extruding 577,362 mm³
The machine is running at half the commanded speed and there is no setting that fixes it. The plastic simply cannot be melted faster. Change the numbers yourself in the print time estimator and watch the speed input stop having any effect at all beyond a certain point.
Every nozzle size shows this effect somewhere; a full millimetre shows it at ordinary settings rather than at extreme ones. Ask for more plastic per second than the melt zone can produce and the extra request is simply discarded — the head slows down to match, and the figure you typed describes your intention rather than the machine's behaviour.
When it is nevertheless the right choice
Despite that, this size wins on the geometry it suits, because it moves an enormous amount of plastic per pass even at a crawl:
- Very large parts where a 0.6 mm nozzle would take days.
- Moulds and formers for casting concrete, plaster or composites, where the printed part is a shape rather than a product.
- Structural prints — thick single-wall shells where a 1.15 mm line is genuinely a structural member.
- Rough prototypes where you want to see the form tomorrow morning, not next week.
What you cannot do with it
Anything with detailed geometry. A 1.15 mm extrusion cannot describe a fillet, a thread, a small hole or any text worth reading. This is not a limitation to work around; it is the defining characteristic of the size.
It also demands more of everything else in the machine. The extruder needs torque to push that much filament, the part-cooling fans need to remove much more heat per second, and the frame is doing more work per move.
Hotend requirements, specifically
A nozzle this size is only useful behind a melt zone designed for volume. The relevant designs use a longer heated path, an internal geometry that increases the contact area between the filament and the hot metal, or both. A standard hotend with a 1.0 mm nozzle screwed into it is a standard hotend, and it will deliver standard flow through a bigger hole — which produces under-extrusion rather than speed.
If you are considering this size, check what your hotend is rated for before you buy the nozzle. That is the purchase order that saves money.
Retraction, oozing and the practical annoyances
A large melt zone holds a large volume of molten plastic under pressure, and all of it wants to come out when the head moves. Expect:
- More oozing on travel moves, which the nozzle oozing during travel page covers.
- Longer retraction distances than any smaller nozzle needs.
- A more pronounced Z seam, because the pressure change at a layer start is larger.
- Slower colour and material changes, because there is more of the old filament to flush.
Where it sits among the sizes
This is a specialist's nozzle for a specialist's geometry, and for most people the 0.8 mm captures nearly all the speed and strength benefit while staying inside what a good mainstream hotend can feed. The 0.6 mm is the size most functional printing should actually be done at.
Fit a full millimetre when the part is large, the detail is irrelevant and your hotend was built for flow. Otherwise you will be printing slowly through a big hole, which is the worst of both trades.